Window assembly

ABSTRACT

A metal building enclosure of the type employing cooperating stationary sash and movable window frames is disclosed. The sash and cooperating movable frames are each comprised of a plurality of frame sections and the movable frame includes an actuating element in the form of a flexible movable elongated metal band which extends about its periphery. Movable fittings, for example closure members, are coupled to the actuating element band and are moved therewith with respect to stationary fittings mounted on the sash frame.

United States Patent 1191 1111 3,866,355 Jacob 1 1 Feb. 18, 1975 1 1 WINDOW ASSEMBLY 3.368.306 2/1968 V011 Wcdel ct 111 49/192 [75] Inventor: Gernot Jacob, Deggendorf, FOREIGN PATENTS OR APPLICATIONS Germany 1.936542 1/1971 Germany 49/192 Assignee: Gotz Metallbau GmbH, gg fi 1,961,992 6/1971 Germany 49/192 Grosswaldmg Germany Primary Examinerl(enneth Downey [22] Filed: Aug. 2, 1973 21 Appl. No.: 384,955 [57] ABSTRACT A metal bu1ld1ng enclosure of the type employmg cooperating stationary sash and movable window frames 1 1 Foreign Appllcatlon Data is disclosed. The sash and cooperating movable frames Aug. 7. 1972 Germany 2238862 are each comprised of a plurality of frame sections and the movable frame includes an actuating element [52] US. Cl. 49/192, 49/193 in the form of a flexible movable elongated metal [51] Int. Cl E05d 15/52 band which extends about its periphery. Movable fit- [58] Field of Search 49/192, 193; 160/107 tings, for example closure members, are coupled to the actuating element band and are moved therewith [56] References Cited with respect to stationary fittings mounted on the sash UNITED STATES PATENTS frame- 2.179.763 11/1939 Smolowitz 160/107 21 Claims, 24 Drawing Figures mmmrialalms 3,866,355

' sum 01m 12 FIG. 2 79 PMENIEU 3,866,355

' SHEET DZUF 12 mmgg FEB 1 8 I975 SHEET 0 0F 12 pmmgriarslsrs Q 3866,3555

SHEET user 12 PMENTEU FEB] 8 I975 SHEET USUF 12 III/III I II/IIIll III PATENTEDFEBI 8191s 3.866.355 SHEET lOUF 12 VIIII'II" PATENTEU E 3,866,355

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WINDOW ASSEMBLY BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the fabrication of metal windows with sash and window frames comprised of frame sections. More specifically, this invention is directed to metal windows and the like wherein the window frame unit includes a movable actuating element which passes around the frame for the purpose of actuating the movable members of various fittings. Accordingly, the general objects of the present invention are to provide novel and improved methods and appartus of such character.

2. Description of the Prior Art Reference may be had to published German Patent No. 1,509,606 for an example of a metal window assembly of the general type to which the present invention is directed. Metal window assemblies of the type exemplified by the above referenced German specification have previously been designed such that the movable fittings on the window frame and the cooperating fixed position fittings on the sash frame must be installed at preselected prepared positions in order to insure proper functioning of the window after installation. The requirements for such precise positioning increases the difficulty of manufacturing the individual elements which are assembled to define the window and also increases installation problems. Also, due to a number of design deficiencies, prior art metal windows of the type to which the present invention is directed have been plaqued by fittings, for example closure devices, which did not always operate with the desired case. These operating difficulties may, in part, be attributed to the fact that the actuating element, which passed around the frame, changed direction rather abruptly at the corners of the window frame; such abrupt changes of direction presenting substantially increased resistance to displacement of the actuating element.

SUMMARY OF THE INVENTION The present invention overcomes the above briefly discussed and numerous other deficiencies and disadvantages of the prior art by providing a metal window assembly characterized by the ability of being mounted simply and quickly and further characterized by smooth reliable operation of the various movable fitting elements by means of a mechanism which is substantially maintenance free.

A window in accordance with the present invention employs, as an actuating element, a flexible perforated metal band which passes about the periphery of the window frame. Movable fittings, which cooperate with stationary fittings on the metal sash frame, are connected to the metal band actuating element at any desired point along the periphery of the window. The installation of the fittings is accomplished without the need for the actuating element itself to be provided with connecting points having a special configuration. Thus, in accordance with a preferred embodiment of the present invention, a window frame is provided about its outer periphery with a guide track for a flexible metal band; the band being perforated and facing the space between the window frame and the sash frame. The window frame unit is partly of box-like construction. Longitudinal window frame sections having such box-like construction are joined together by means of corner sections. The corner sections have spaced legs which are received in the box-like portions of the longitudinal sections and the corner sections additionally are provided with a curved element located between the spaced legs. The curved elements of the frame corner sections define curved extensions of the guide track whereby the metal actuating band may pass from one longitudinal window frame section to the next and transversely oriented longitudinal frame section without undergoing any abrupt changes in direction. Due to the manner of construction of the window frame corner sections, substantially the entire thickness of the frame sections in the direction of the window plane is employed to achieve a rounded guide track at the corners of the window without reducing the crosssection of the corner sections which determine the strength of the window frame corner joints.

To facilitate attachment of fittings to both the window frame and to the cooperating sash frame, the corresponding frame sections are each provided with at least a first groove which opens outwardly in a substantially vertical direction with respect to the plane of the window. The window and sash frame sections are also provided with grooves which open in a direction parallel to the window plane. The various fittings; such as closure elements, tilt bearings and the like; are provided with suitably shaped projections which engage the grooves in the frame sections and the fixed position fittings are maintained in the desired position by means of self-tapping screws. The movable fittings are provided with pins which engage perforations in the metal band actuating element.

BRIEF DESCRIPTION OF THE DRAWING The present invention may be better understood and its numerous objects and advantages will become apparent to those skilled in the art by reference to the accompanying drawing wherein like reference numerals refer to like elements in the several figures and in which:

FIG. 1 is a perspective view of a longitudinal section and a cooperating corner section of a window frame in accordance with the present invention;

FIG. 2 is a cross-sectional, front elevation view of the window frame corner section of FIG. 1;

FIG. 3a is a perspective view of a longitudinal sash frame section of a window in accordance with the present invention, the sash frame section of FIG. 3a having a fixed fitting of a locking mechanism mounted thereon and cooperating with the window frame section of FIG. 1 to in part define a window assembly;

FIG. 3b is a perspective view of a window frame longitudinal section of the type shown in FIG. 1 having mounted thereon the movable fitting of a locking mechanism;

FIG. 30 is a cross-sectional side elevation view of the sash and window frame sections of FIGS. 3a and 3b showing the cooperating relationship of the fittings of the locking mechanism; a

FIG. 4a is a perspective view of a longitudinal sas frame section having the fixed fitting portion of a tilt bearing mounted thereon;

FIG. 4b is a perspective view of a longitudinal window frame section having the movable fitting portion of a tilt bearing mounted thereon;

FIG. 4c is a further cross-sectional side elevation view of a window assembly in accordance with the present invention; FIG. 40 showing the cooperating relationship between the fixed and movable portions of the tilt bearing of FIGS. 4a and 4b;

FIG. a is a perspective view, partly in section, of a right-hand lower corner portion of the sash frame of a window assembly in accordance with the present invention, the sash frame of FIG. 5a having the stationary element of a corner bearing mounted thereon;

FIG. 5b is a perspective view of the right-hand bottom corner of a window frame in accordance with the present invention, the frame of FIG. 5b having mounted thereon a corner bearing fitting which cooperates with the bearing element of FIG. 5a;

FIG. 5c is a cross-sectional side elevation view of the sash and window frames in the region of the corner bearing of FIGS. 5a and 5b;

FIG. 6a is a perspective view, partly in section, of the right-hand upper corner of a sash frame in accordance with the present invention;

FIG. 6b is a perspective view of the right-hand upper corner ofa window frame in accordance with the present invention;

FIGS. 6c and 6d are cross-sectional side elevation views through the sash and window frame corner portions of FIGS. 6a and 6b;

FIG. 7 is a cross-sectional side elevation view through the sash and window frames in the region of the actuating mechanism for a locking bar depicted in FIG. 6b;

FIG. 8a is a perspective view, partly in section, of a window frame longitudinal section including a shear arm guide;

FIG. 8b is a cross-sectional side elevation view of the sash and window frames in the region of the shear arm guide of FIG. 8a;

FIG. 80 is atop view of the shear arm guide of FIGS. 80 and 8b;

FIG. 90 is a top view of a securing device mounted on the upper section of a window frame in accordance with the present invention;

FIG. 9b is a cross-sectional view of the sash and window frames in the region of the securing device of FIG. 9a; and

FIGS. l0a-I0c are views of an actuating mechanism and associated tensioning device in accordance with the present invention, FIG. c consisting of a perspective sectional veiw of the actuating and tensioning mechanism installed on a longitudinal window frame section.

DESCRIPTION OF THE PREFERRED EMBODIMENT:

Referring jointly to FIGS. 1 and 3c, a window frame section I in accordance with the present invention is depicted respectively in perspective and cross-sectional views. The window frame includes a longitudinal box section 2 which will be situated at the inside of the window. As may best be seen from FIG. 3c, a flange 3 projects downwardly from box section 2 at the side thereof disposed inwardly with respect to the window; flange 3 being oriented parallelly with respect to the window pane. The flange 3 is provided with an outwardly extending short projection which defines a groove 4; the groove 4 opening outwardly at a right angle with respect to the plane of the window.

As best seen from FIG. 1, a second flange member 5 projects outwardly, at right angles to the plane of the window, from box section 2 of the window frame. The flange member 5 is shaped, for the purposes to be described below, so as to define upper and lower grooves indicated respectively and generally at 6 and 7. The grooves 6 and 7 are formed with recessed side walls so as to permit locking engagement of components in the grooves in the manner to be described below. The groove or recess 6 thus opens toward the inside of the frame whereas the groove 7 will open outwardly in the direction of the space between the window frame and the sash frame.

As may be seen from FIG. 3c, the groove 6 in flange 5 will receive the anchoring flange portion 8 of a glazing member 9 comprised of synthetic rubber or other suitable material with similar characteristics. The glazing member 9 retains, by means of the anchoring flange 8 and a further portion 10 which envelopes the front end of flange 5, a double insulating window pane unit 11 within the window frame. In accordance with the disclosed embodiment the glazing member 9 is the sole means of attachment of the window pane unit in the frame.

The bottom of window frame box section 2; i.e., the side of the box section which faces the space between the window frame and the sash frame; is provided with a stepped groove as shown in FIGS. 3b and 3c. This stepped groove includes a comparatively wide shallow recess 13 which defines a guide track for a perforated metal band 14; short sections of the perforated band 14 being shown in FIGS. 1 and 3b. The center portion of the groove; i.e., the portion 12 intermediate the shoulders which define the guide track 13; is of greater depth than guide track 13 for purposes which will become obvious from the discussion below.

The window frame sections, such as section 1 of FIG. I, are mitred at the frame corners and are provided with cut-out portions of guide track 13 which extend inwardly from the ends of the frame. Corner joint sections, such as the section indicated generally at 15 in FIG. I, are employed to connect adjacent mitred window frame sections. The corner joint sections 15 have side flanges l6 and 17 which define opposite sides of an open channel structure corresponding in shape to the inner cross-section of the frame box section 2. The corner joint sections 15 are also provided with curved elements 18 as may be clearly seen from FIG. 2. With a pair of window frame sections interconnected by means of a corner joint section, the flanges l6 and 17 are inserted into the ends of adjacent, transversely oriented: box sections 2 and the curved element 18 connects the oppositely disposed and recessed ends of the frame section guide tracks. Thus, as can be seen from FIG. 2, the curved elements 18 are configured such that, with the corner joint section inserted into the frame box sections, the end points 19 of curved element 18 will be positioned adjacent the ends of the cutouts in the frame guide tracks 13 and element 18 will insure a steady transition from the guide track of a first frame section to the guide track of an adjacent transversely oriented frame section.

In order to insure the positioning and retention ofthe corner joint sections 15 in the box section of the frame sections, an inwardly facing ridge 3! is provided in each of box sections 2 as may best be seen from FIGS. 3b and 3c. The ridge 31 will engage the side flange 1 6 of the corner joint section 15. This arrangement enhances the strength of the entire assembly with respect to stresses directed transversely to the plane of the window.

As previously noted, the metal band 14 positioned in the guide tracks 13 of the frame sections passes over the curved elements 18 of the frame corner joint sections 15. The ends of the metal band 14 are connected to a tensioning device of the type shown in FIG. c. In addition to tensioning band 14, the tensioning device can be moved to the left or right in the peripheral direction by means of an actuating mechanism operated with the aid of the window actuating lever to thereby cause the metal band 14 to move along the outer circumference of the window frame.

The corner joint sections 15 may be comprised of plastic but are preferably formed from die cast zinc since this material possesses excellent self-lubricating properties with respect to a steel band. Since, as briefly discussed in the preceding paragraph, the band 14 is preferably comprised of steel and will move along the outer circumference of the window frame, the providing of self-lubricating material in the corners will insure smooth operation of the actuating mechanism. In addition, as shown in FIGS. 1 and 2, the corner joint sections 15 are provided with holes whereby the sections 15 may be fixed to the ends of the longitudinal window frame sections by means of selftapping screws. For further reinforcement of the corner joints of the window frame, additional cornerjoint sections 15 having legs which cooperate with grooves 6 and 7 of the flange 5 may be provided. Such additional reinforcing members have not been shown in the drawing in the interest of facilitating understanding of the invention.

The structure of the sash frame which cooperates with the above described window frame can best be seen from a joint consideration of FIGS. 30 and 3c. A sash frame beam defining member, indicated generally at 21, forms the part ofa thermally insulated composite frame section which is located on the inside of the window. The outer part 22 of this composite sash frame section is connected to the inner part 21 by means of insulating members 23; the insulating members being substantially T-shaped and engaging one another and the members 21 and 22 in the manner shown in FIG. 3c. It is to be noted that the insulating members 23 and the outer frame part 22 have been omitted from the perspective views of the sash frame in the interest of facilitating understanding of the invention.

Sash frame member 21 includes a longitudinal box section 24. A flange 25 extends upwardly from box section 24, on the side thereof which faces the outside of the window, in a direction parallel to the plane of the window. The flange 25 terminates in an outwardly inclined ledge 26 which, as may be seen from FIG. 30, cooperates with a sealing lip on the glazing member 9 to form an inner window seal. An external window seal is provided by cooperation between the outer member 22 of the sash frame and the front face of portion 10 of the glazing member 9 as indicated at 28 in FIG. 30. The upper side of box section 24 of sash frame member 21; i.e., the side of the box section which faces the opening defined by the sash frame, is provided with an L-shaped projection. which defines a groove indicated generally at 29 and a further projection on flange 25, which defines a groove indicated generally at 30. The grooves 29 and 30 open toward the inside of the window and serve, in the manner to be described below to mount closure and bearing elements.

FIG. 3a shows a closure element 32 mounted on the member 21 which in part defines sash frame; closure element 32 engaging groove 29 by means of a projection 33 of hook-shaped cross-section and engaging groove 30 by means of a projection 34. The cooperation between the grooves on the sash frame and the projections on the closure member may be clearly seen in FIG. 3c. As shown in FIG. 3a, the closure element 32 is fixed in position on the sash frame by means of self tapping screws 35. The flank portions of screws 35 abut the outwardly facing side of the L-shaped projection which defines groove 29 and the ends of the screws contact the upper surface of member 21. Tightening of the self-tapping screws 35 against member 21 will, as a result of the elasticity of the sash frame member 21 and the closure element 32, reliably restrain the element 32 against longitudinal movement.

A locking device 36 mounted on the window frame will cooperate with closure element 32. The locking device 36 is shown in FIGS. 3b and 3c. Locking device 36 includes a planar portion 37 which is engaged in groove 4 in flange 3 of the window frame. Locking device 36 also includes a lug 38 having a hookshaped crosssection which extends upwardly from portion 37 so as to be engaged in groove 7 as best seen in FIG. 3c. Since the groove 4 is deeper than groove 7 the locking device 36 may be inserted without difficulty into the window frame section and may thereafter be secured in the desired position by means of self-tapping screws 39; the ends of screws 39 projecting through perforations in metal band 14. Through longitudinal displacement of the metal band 14, by means of the actuating mechanism, a locking projection 40 on locking device 36 may be placed either in a position adjacent to the closure element 32 or in a position opposite to the closure element as shown in FIG. 30. Smooth and reliable actuation of the locking device 36, to move the projection 40 into and out of cooperating relationship with the closure element 32, is possible due to the fact that the steel band 14 is subject only to tension. Locking arrangements in accordance with FIGS. 3a, 3b, and 30 may be provided in any desired number at virtually any point about the periphery of the window and the locking devices can be fitted to a previously installed window.

Considering now FIGS. 4a-4c, if a window in accordance with the present invention is to be hinged at the bottom so as to enable the window to be swung inwardly, the lower sash frame beam defining member 21 will be provided with a tilt bearing. The tilt bearing includes a stationary fitting 41 which is fixed to sash frame member 21 in the manner shown in FIGS. 4a and 4c. Fitting 41 includes a lug 42 of hook-shaped crosssection which engages the groove 29 in the same manner as described above with respect to the closure element 32 of FIG. 3a; the fitting 41 thus being retained in position on the sash frame through the use of selftapping screws 44 which penetrate a portion 43 of fitting 41 which extends upwardly and over the sash frame L-shaped projection which defines the groove 29. The fitting 41 also includes a camming portion 430, also of hook-shaped cross-section, which is oriented toward the outside of the window.

The camming section 4311 of fitting 41 cooperates with oppositely oriented hook-shaped cam projections 46 provided on a displaceable fitting 45. The fitting 45 is connected to the window frame in the manner depicted in FIG. 4b. The guidance of fitting 45 along window frame section 1 and the connection of the fitting to metal band 14 are similar to the arrangement described above with regard to the mounting of locking device 36 on the window frame. The spacing between the cam projections 46 is selected to facilitate closing ofthe window by moving the cams 46 past the cam 43a. Movement of the fitting 46 by means of the metal band 14 is, however, possible only when the closure position has been reached whereupon the fitting 45 can be moved to a position generally corresponding to that shown in FIG. 40 in which one of the cams 46 engages the cam 43a from the rear and the cams cooperate to form a tilt bearing for the window. By tapering the mating faces of the closure fittings and the tilt bearings the window frame will be pulled tightly against the sash frame when the fittings are actuated so that a reliable seal can be achieved at the point indicated at 28 in FIG. 30.

In addition to the tilt bearing described above, lower corner bearings are provided to support the window against the lower sash frame beams. The shape and ar rangement of the lower corner bearings may be seen from FIGS. 541-50. The fixed fitting 47 of each corner bearing, as shown in FIG. a, includes a base 48 which engages the groove 29 of frame section 21 by means of a lug 49 as shown in FIG. 50. In addition, the base 48 of fitting 47 is retained in the longitudinal channel shaped recess at the top of frame section 21 by means of a self-tapping screw 50 which is provided with a spanner head; screw 50 being inserted through a portion of fitting 47 which extends up and over the L- shaped projection which defines groove 29 whereby the flank of screw 50 is in abutting relationship with the side of such projection. In addition, base 48 of fitting 47 is provided with a pair of arms 52 one of which engages the groove 29 of the sash frame section which projects vertically from the lower sash frame beam member whereby lateral displacement of the corner bearing is prevented.

The corner bearing fitting 47 is provided with a bolt 53 having a spherical head. The bolt 53 is supported, in the manner shown in FIG. 5c, in such a manner that the weight of the window sash is transmitted evenly to the sash frame over the comparatively large area defined by base 48 of fitting 47. Due to its symmetrical design, the fitting 47 may be used in both the left and right corners of the sash frame.

The spherical head of bolt 53 is received crosssection; and thus supports a mating bearing cup 54 provided on a fitting 55 which is affixed to the window frame. As may be seen from FIG. 5b, the fitting 55 is designed so as to enable its use at opposite corners of the frame. An angular base of the fitting 55 engages, by means of a front edge, the groove 4 defined by flange 3 of the window frame. Fitting 55 is also provided with a pair of legs 56 and 57 which include lugs 58 of hookshaped across-section; the design of lugs 58 being best seen from FIG. 5c. The lugs 58 are engaged in the groove 7 on the outside of the window frame and are secured in this position by self-tapping screws 59. Screws 59 are tightened against the window frame section and the flanks of the screws are in abutting relationship with an edge of the frame section which defines the groove 7.

The center of the spherical heads of bolts 53 and the axis of rotation of the tilt bearings will be situated on the same horizontal axis parallel to the lower sash frame beam. The mounting of the fitting 55 in a corner of the window frame is extremely simple and is carried out by placing the fitting 55 in the corner in such a way that the lugs 58 project into the groove 7. Thereafter, by displacing the fitting 55 in the direction of the inside of the window, the frontal edge of the fitting 55 is inserted into the groove 4 and the lugs 58 will be engaged under the recess of groove 7. Thereafter, the screws 59 are inserted and tightened. The perforated metal band 14 will, of course, pass under the fitting 55.

Referring to FIGS. 6a, 60 and 6d, the window sash frame is also provided with an upper corner bearing fitting 60 which is substantially identical in shape and function to the fitting 47 of the lower corner bearing. In the case of the upper corner bearing, however, a cylindrical bearing bolt 61 is employed rather than a bolt with a spherical head. The cylindrical bearing bolt 61 is fixed to the base of the fitting 60 and cooperates with a bearing cut-out provided in a cooperating upper corner bearing fitting which is attached to the window frame. As a further distinction between fittings 47 and "I Q 60, the base of the fitting 60 is longer in the direction of the upper sash frame beam and is secured thereto by means of two self-tapping screws 62. At a point 63 displaced from the bearing bolt 61 and fitting 60 is provided with a shear arm 64; arm 64 being connected at its opposite end to the inward-swinging bottomhinged window.

An upper corner fitting for the window frame is indicated generally at 65 in FIG. 6b. Fittings 65 are similar to window frame lower fittings 55 except that in the case of the upper fittings 65 each leg is retained in position by means of a pair of self-tapping screws 66. The upper window frame fittings 65, as is the case with the upper sash frame corner bearing fittings 60, are symmetrically designed so that they may be employed at either of the upper corners of the window frame. It will, of course, be obvious that the attachment points for the bearing bolt 61 and shear arm 64 must be reversed in the case of the sash frame fittings 60 between opposite corners.

Each of the upper window frame corner fittings 65 is provided with a guide slot 67 which receives a locking bar 68. The locking bar is retained in the guide slot by means of a lug or projection 69 which extends outwardly over slot 67. In addition, each fitting 65 is provided with a slide-type recess or channel 70 which intersects slot 67. Recess 70 will receive the cylindrical bearing bolt 61 on a cooperating sash frame fitting 60. When the bolt 61 has reached the bottom of recess 70 it may be locked in the recess by means of the locking bar 68. Accordingly, the locking bar 68, recess 70 and bearing bolt 61 cooperate with the corner bearings described in the discussion of FIGS. Sa-Sc to form a swing bearing for the window.

Continuing with a discussion of FIG. 6b, movement of locking bar 68 is achieved via a locking bar clamp 71 which is connected to the metal band 14. The manner by which connection of the clamp 71 to band 14 is achieved'may best be seen from FIG. 7; the clamp 71 including a stud 72 which engages a perforation in band 14. The base portion 73 of clamp 71 engages the groove 4 of the window frame section. The connection between clamp 71 and bar 68, which rests in a slot provided therefore in the clamp, is achieved by means of a locking screw 74.

FIGS. 80 and 8b depict the means for fastening the front end of shear arm 64 of FIG. 6a to the window frame. The attachment means includes a guide 75 having a base portion 76. The underside of the base portion 76 has a projection 77 which defines a lug of hookshaped cross-section which is received in and engages the groove 7 in flange 6 of the frame. A pair of selftapping screws 78 pass obliquely through shear arm guide 75 and are, as may be seen from FIG. 8b, supported at their ends against the vertical section wall 79 at the outwardly disposed side of recess 7. Screws 78 cooperate with lug 77 to retain the shear arm guide 75 in the position shown in FIG. 8b.

The shear arm guide 75 also includes a flange portion 81, extending toward the outside of the window in a direction transverse to the plane of the window, which is provided with a guide slot 80. The guide slot 80 is oriented in a generally inclined upward direction from base 76 so that the slot is substantially situated above the band 14.

FIG. 80 is a top view of the shear arm guide 75 of FIGS. 8a and 8b. As may be seen from FIG. 80, the guide slot 80 has, at the end adjacent to the bearing of shear arm 64 on the sash frame, a portion 80a inclined at an angle toward the outside of the window. The lower end of a bolt 64a attached to the end of shear arm 64 is engaged in slot portion 80a in the tilted or opened position of the window. The configuration of bolt 64a may be clearly seen from FIG. 8b. A substantially fork-shaped tilt locking device 80c, connected to metal band 14 by means of pins 80b, is received in groove 4 of the window frame; one leg of the forkshaped tilt locking device facing the inside of the window and the opposite leg being located below an appro priately shaped recess in the shear arm guide 75. The fork leg of the tilt locking device 80c positioned toward the outside of the window is provided with a lug 80d which extends inwardly. The tilt locking device 800 and thus the lug 80d is movable by means of displacement of metal includes 14 in the direction of the arrow shown in FIG. 8 c. W V r..

FIGS. 9a and 9b show a securing mechanism which is also fixed to the upper transverse beam of the window frame. This securing mechanism inlcues a base protion 82 with a projection 83 extending therefrom into he goove 4 of the window frame section 1. The securing mechanism is also provided with a hook-shaped lug 84 which is received in and engages the groove 7 of the window frame. The base 82 of the securing mechanism is affixed to the window frame in the position shown in FIG. 9b by meansof self-tapping scres 85. The portion of base 82 of the securing mechanism which is located closest to the inside of the window defines a guide for a locking rail 87; the locking rail being connected by means of pin 86 to the metal band 14. The locking rail 87 is provided with a cam-projection 88 which cooperates, in the manner to be described below, with a locking lever 89. The locking lever 89 is attached to the base portion 82 of the securing mechanism by means ofa pine 90. The locking lever 89 is provided, at one end, with a roller 92. The lever 89 is urged, by means of a spring 91, in the direction whereby roller 92 is pressed, in the closed position of the window, against the flange 25 of the sash frame section. In the locked position of the window the lever 89 assumes the position shown in FIG. 9a. In this position the metal band 14 can be displaced in the peripheral direction by means of actuating lever 89 since cam 88 on locking rail 87 does not engage the second end of the lever 89. However, ifthe upper beam of the window frame moves away from the upper sash frame beam during opening of the window the locking lever will be swung clockwise with respect to the position shown in FIG. 9a thus blocking the locking rail 88.

To further describe the arrangement of FIG. 9a, it is to be noted that lever 89 is provided with cut-outs which enable the screws of the securing mechanism to be reached by means of a spanner wrench. This arrangement makes it possible to pre-assemble the entire securing mechanism separately from the window frame and to thereafter attach the securing mechanism to the frame.

Referring now to FIGS. 10a and 10b, an actuating mechanism for a window in accordance with the present invention is shown. The actuating mechanism comprises a window actuating lever 93 and a gear housing 94. A pair of attachment bolts 95 project outwardly from housing 94. The outer ends of bolts 95 are provided with sawtooth-shaped recesses or serrations 96 which extend inwardly from the end of the bolts a distance corresponding at least to the width of the groove 7 of the window frame. If the bolts 95 are inserted through holes in the window frame section in the manner shown in FIG. 100. a locking bar member 97 can be pressed from outside into the groove 7 whereby slots or cut-outs 98 of bar 97 will be caused to partly encircle the serrated portions 96 of bolts 95 and the inner walls of the slots 98 of bar 97 will be gripped by the sawteeth 96 of bolts 95. In addition, wedging is brought about by a slight dimensional difference between the width of slots 98 and the diameter of the bolts 95. The materials from which the bolts 95 and bar 97 are fabricated will be selected so that the serrations at the ends of bolts 95 can at least partly penetrate into the side faces of the slots 98 in bar 97.

A rotatable actuating tongue 99 projects from the gear housing 94 of the actuating mechanism. Tongue 99 extends, through a slot provided in the window frame section, into a transverse recess 100 of the above-mentioned tensioning device 101; the tensioning device being shown in FIG. 10c. The tensioning device 101 is formed from an upper half 102, which defines the recess 100, and a lower half 103. Portion 102 of the tensioning device will engage the holes in one end of band 14 by means of pins while the other portion 103 of the tensioning device will engage the perforations in the other end of band 14 by means of pins. As indicated at 104, the upper and lower halves 102 and I03 of the tensioning device engage one another by means of cooperating serrations. After tensioning of the band 14, the tensioning device halves 102 and 103 can be firmly locked together in any suitable manner; the means by which such locking is acheived not being disclosed; whereupon play-free actuation of the metal band 14 is possible. The design of the actuating mechanism, and particularly the tensioning device 101, permits assembly of the window in the shortest possible time.

The self-tapping screws with spanner heads, which are used in part to locate the fixed fittings and in part for connecting the moving fittings to the metal band in accordance with the present invention, are provided at their ends with cylindrical tips as shown in various figures. The diameter of the cylindrical tips corresponds to the core diameter of the thread of the screws. The bore holes provided in the various fittings are shaped such that the cylindrical tips of the self-tapping screws can be pressed into the bore hole and the screws will be retained in the fittings prior to tightening. The fittings can therefore be provided with the requisite screws prior to assembly with the window frame or sash frame; this technique further facilitating assembly.

While a preferred embodiment has been show and described, various modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Thus, by way of example, although the invention has been described in relation to a metal window, it is equally applicable to metal doors. Accordingly, it is to be understood that the present invention has been described by way of illustration and not limitation.

What is claimed is: l. A window assembly comprising: a sash frame, said sash frame being comprised of metal and including a plurality of frame sections; a window frame which cooperates with said sash frame to define the window assembly, said window frame being comprised of metal and including: at least four transversely oriented elongated box sections, each of said box sections defining a guide track at a first external side thereof; first flange means extending outwardly transversely from the second side of each of said box sections, said box section second sides being adjacent and oriented transversely to said box section first sides, said first flange means having at least a first groove which opens in the same direction as said guide track; second flange means extending from each of said box section first sides in a direction transverse to said first flange means, said second flange means defining grooves which are adjacent and parallel to said guide tracks; corner sections for joining transversely oriented box sections, said corner sections including arm means which are received in said box sections, said corner sections further including a curved surface defining element, said curved surface defining element forming a curved connection extension of the guide tracks on adjacent transversely oriented box sections; at least a first fixed fitting mounted on one of said sash frame sections; at least a first movable fitting mounted on one of said window frame box sections for cooperating with said fixed fitting; actuating means for said movable fitting, said actuating means comprising a flexible metal band extending about substantially the entire periphery of said window frame, said flexible metal band being disposed in the guide track defined by said window frame box and corner sections; and lever means for imparting motion to said actuating means metal band. 2. The apparatus of clairn 1 wherein each of I said elongated window box 'sections furfhe r compfises:

a longitudinal project extedning into said box section from said first side thereof, said longitudinal projection cooperating with one of said corner section arm means.

3. The apparatus of claim 1 wherein said window frame first flange means each comprises:

a member which extends outwardly from said box section second side, said member having a first recessed groove parallel to a plane defined by said window frame, said first groove opening in a direction away from the frame opening, said outwardly extending member further defining a second recessed groove oriented parallel to the said frame defined plane and facing toward the frame opening, said second recessed groove receiving a glazing member.

4. The apparatus of claim 2 wherein said window frame first flange means each comprises:

a member which extends outwardly from said box section second side, said member having a first recessed groove parallel to a plane defined by said window frame, said first groove opening in a direction away from the frame opening, said outwardly extending member further defining a second recessed groove oriented parallel to the said frame defined plane and facing toward the frame opening, said second recessed groove receiving a glazing member.

5. The apparatus of claim 1 wherein said actuating means metal band is provided with perforations and wherein the movable fitting comprises:

a base member;

lug means extending from said base member into said second flange means defined groove; and

pin means extending through said base means and engaging the perforations in said band.

6. The apparatus of claim 5 wherein said movable fitting further comprises:

a projection extending generally transversely to said base means, said projection being designed for locking insertion in said first flange means first groove.

7. The apparatus of claim 4 wherein said actuating means metal band is provided with perforations and wherein the movable fitting comprises:

a base member;

lug means extending from said base member into said second flange means defined groove; and

pin means extending through said base means and engaging ther perforations in said band.

8. The apparatus of claim 7 wherein said movable fitting further comprises:

a projection extending generally transversely to said base means, said projection being designed for locking insertion in said first flange means first groove.

9. The apparatus of claim 1 wherein said sash frame comprises:

at least four elongated frame sections, said elongated sash frame sections each being provided with at least a first projection which defines a lognitudinal groove oriented parallel to the plane of the window, the opening of said sash frame first projection define longitudinal groove facing in the opposite direction to the opening of the adjacent window frame second flange means defined groove.

10. The apparatus of claim 9 wherein said fixed fitting comprises:

a base portion;

a hook-shaped locking lug extending from said base portion and engaging a sash frame section longitudinal groove; and

fastener means passing through said fixed fitting base portion and contacting said sash frame elongated section first projection to restrain said fixed fitting against longitudinal movement.

11. The apparatus of claim 7 wherein said sash frame comprises:

at least four elongated frame sections, said elongated sash frame sections each being provided with at least a first projection which defines a longitudinal groove oriented parallel to the plane of the window, the opening of said sash frame first projection defined longitudinal groove facing in the opposite direction to the opening of the adjacent window frame second flange means defined groove.

12. The apparatus of claim 11 wherein said fixed fitting comprises:

a base portion;

a hook-shaped locking lug extending from said base portion and engaging a sash frame section longitudinal groove; and

fastener mean passing through said fixed fitting base portion and contacting said sash frame elongated section first projection to restrain said fixed fitting against longitudinal movement.

13. The apparatus of claim 10 wherein said fixed fitting base portion comprises:

a first base member;

a second base member integral with said first base member and oriented transversely to said first base member, said first and second base members being of identical shape and size;

a first bearing defining projection extending from the outwardly facing surface of said first base member; and

a second bearing defining projection extending from the outwardly facing surface of said second base member, said first and second bearing defining projections being symmetrically shaped and positioned whereby said fixed fitting can be employed at any corner of a rectangularly shaped window.

14. The apparatus of claim wherein said movable fitting base member comprises:

a first base element;

a second base element integral with said first base element and oriented transversely to said first base element, said first and second base elements being of identical shape and size;

a first bearing receiving socket extension on the outwardly facing surface of said first base element; and

a second bearing receiving socket projection on the outwardly facing surface of said second base element, said first and second bearing receiving sockets being symmetrically shaped and positioned whereby said movable fitting can be employed at any corner of a rectangularly shaped window.

15. The apparatus of claim 13 wherein said movable fitting base member comprises:

a first base element; a second base element integral with said first base element and oriented transversely to said first base 5 element, said first and second base element being of identical shape and size; a first bearing receiving socket extension on the outwardly facing surface of said first bsae element; and a second bearing receiving socket projection on the 0 outwardly facing surface of said second base element, said first and second bearing receiving sockets being symmetrically shaped and positioned whereby said movable fitting can be employed at any corner of a rectangularly shaped window.

16. The apparatus of claim 12, wherein said fixed fitting further comprises:

a projection extending from said base portion, said projection defining the stationary bearing surface of a tilt bearing.

17. The apparatus of claim wherein said fixed fitting further comprises:

an upper corner bearing defining projection extending from said base portion.

18. The apparatus of claim 17 further comprising:

a shear arm mounted to said base portion.

19. The apparatus of claim 18 wherein said movable fitting comprises:

means defining a shear arm guide.

20. The apparatus of claim 16 wherein said movable tting further comprises:

a projection extending from said base member, said projection defining the movable bearing surface of a tilt bearing.

21. A window assembly comprising:

a sash frame, said sash frame being comprised of metal and including a plurality of frame sections;

a window frame which cooperates with said sash frame to define the window assembly, said window frame being comprised of metal and including a plurality of frame sections;

at least a first fixed fitting mounted on one of said sash frame sections;

at least a first movable fitting mounted on one of said window frame sections for cooperating with said fixed fitting;

actuating means for said movable fitting, said acutating means comprising a flexible metal band extending about substantially the entire periphery of said window frame;

tensioning means for said actuating means band, said tensioning means engaging the opposite ends of said band;

lever means for imparting motion to said actuating means band; and

rotatable tongue means operated by said lever means and engaging said tensioning means for causing longitudinal movement thereof. 

1. A window assembly comprising: a sash frame, said sash frame being comprised of metal and including a plurality of frame sections; a window frame which cooperates with said sash frame to define the window assembly, said window frame being comprised of metal and including: at least four transversely oriented elongated box sections, each of said box sections defining a guide track at a first external side thereof; first flange means extending outwardly transversely from the second side of each of said box sections, said box section second sides being adjacent and oriented transversely to said box section first sides, said first flange means having at least a first groove which opens in the same direction as said guide track; second flange means extending from each of said box section first sides in a direction transverse to said first flange means, said second flange means defining grooves which are adjacent and parallel to said guide tracks; corner sections for joining transversely oriented box sections, said corner sections including arm means which are received in said box sections, said corner sections further including a curved surface defining element, said curved surface defining element forming a curved connection extension of the guide tracks on adjacent transversely oriented box sections; at least a first fixed fitting mounted on one of said sash frame sections; at least a first movable fitting mounted on one of said window frame box sections for cooperating with said fixed fitting; actuating means for said movable fitting, said actuating means comprising a flexible metal band extending about substantially the entire periphery of said window frame, said flexible metal band being disposed in the guide track defined by said window frame box and corner sections; and lever means for imparting motion to said actuating means metal band.
 2. The apparatus of claim 1 wherein deach of said elongated window box sections further comprises: a longitudinal project extedning into said box section from said first side thereof, said longitudinal projection cooperating with one of said corner section arm means.
 3. The apparatus of claim 1 wherein said window frame first flange means each comprises: a member which extends outwardly from said box section second side, said member having a first recessed groove parallel to a plane defined by said window frame, said first groove opening in a direction away from the frame opening, said outwardly extending member further defining a second recessed groove oriented parallel to the said frame defined plane and facing toward the frame opening, said second recessed groove receiving a glazing member.
 4. The apparatus of claim 2 wherein said window frame first flange means each comprises: a member which extends outwardly from said box section second side, said member having a first recessed groove parallel to a plane defined by said window frame, said first groove opening in a direction away from the frame opening, said outwardly extending member further defining a second recessed groove oriented parallel to the said frame defined plane and fAcing toward the frame opening, said second recessed groove receiving a glazing member.
 5. The apparatus of claim 1 wherein said actuating means metal band is provided with perforations and wherein the movable fitting comprises: a base member; lug means extending from said base member into said second flange means defined groove; and pin means extending through said base means and engaging the perforations in said band.
 6. The apparatus of claim 5 wherein said movable fitting further comprises: a projection extending generally transversely to said base means, said projection being designed for locking insertion in said first flange means first groove.
 7. The apparatus of claim 4 wherein said actuating means metal band is provided with perforations and wherein the movable fitting comprises: a base member; lug means extending from said base member into said second flange means defined groove; and pin means extending through said base means and engaging ther perforations in said band.
 8. The apparatus of claim 7 wherein said movable fitting further comprises: a projection extending generally transversely to said base means, said projection being designed for locking insertion in said first flange means first groove.
 9. The apparatus of claim 1 wherein said sash frame comprises: at least four elongated frame sections, said elongated sash frame sections each being provided with at least a first projection which defines a lognitudinal groove oriented parallel to the plane of the window, the opening of said sash frame first projection define longitudinal groove facing in the opposite direction to the opening of the adjacent window frame second flange means defined groove.
 10. The apparatus of claim 9 wherein said fixed fitting comprises: a base portion; a hook-shaped locking lug extending from said base portion and engaging a sash frame section longitudinal groove; and fastener means passing through said fixed fitting base portion and contacting said sash frame elongated section first projection to restrain said fixed fitting against longitudinal movement.
 11. The apparatus of claim 7 wherein said sash frame comprises: at least four elongated frame sections, said elongated sash frame sections each being provided with at least a first projection which defines a longitudinal groove oriented parallel to the plane of the window, the opening of said sash frame first projection defined longitudinal groove facing in the opposite direction to the opening of the adjacent window frame second flange means defined groove.
 12. The apparatus of claim 11 wherein said fixed fitting comprises: a base portion; a hook-shaped locking lug extending from said base portion and engaging a sash frame section longitudinal groove; and fastener mean passing through said fixed fitting base portion and contacting said sash frame elongated section first projection to restrain said fixed fitting against longitudinal movement.
 13. The apparatus of claim 10 wherein said fixed fitting base portion comprises: a first base member; a second base member integral with said first base member and oriented transversely to said first base member, said first and second base members being of identical shape and size; a first bearing defining projection extending from the outwardly facing surface of said first base member; and a second bearing defining projection extending from the outwardly facing surface of said second base member, said first and second bearing defining projections being symmetrically shaped and positioned whereby said fixed fitting can be employed at any corner of a rectangularly shaped window.
 14. The apparatus of claim 5 wherein said movable fitting base member comprises: a first base element; a second base element integral with said first base element and oriented transversely to said first base element, said first and second base elements being of identiCal shape and size; a first bearing receiving socket extension on the outwardly facing surface of said first base element; and a second bearing receiving socket projection on the outwardly facing surface of said second base element, said first and second bearing receiving sockets being symmetrically shaped and positioned whereby said movable fitting can be employed at any corner of a rectangularly shaped window.
 15. The apparatus of claim 13 wherein said movable fitting base member comprises: a first base element; a second base element integral with said first base element and oriented transversely to said first base element, said first and second base element being of identical shape and size; a first bearing receiving socket extension on the outwardly facing surface of said first bsae element; and a second bearing receiving socket projection on the outwardly facing surface of said second base element, said first and second bearing receiving sockets being symmetrically shaped and positioned whereby said movable fitting can be employed at any corner of a rectangularly shaped window.
 16. The apparatus of claim 12, wherein said fixed fitting further comprises: a projection extending from said base portion, said projection defining the stationary bearing surface of a tilt bearing.
 17. The apparatus of claim 10 wherein said fixed fitting further comprises: an upper corner bearing defining projection extending from said base portion.
 18. The apparatus of claim 17 further comprising: a shear arm mounted to said base portion.
 19. The apparatus of claim 18 wherein said movable fitting comprises: means defining a shear arm guide.
 20. The apparatus of claim 16 wherein said movable fitting further comprises: a projection extending from said base member, said projection defining the movable bearing surface of a tilt bearing.
 21. A window assembly comprising: a sash frame, said sash frame being comprised of metal and including a plurality of frame sections; a window frame which cooperates with said sash frame to define the window assembly, said window frame being comprised of metal and including a plurality of frame sections; at least a first fixed fitting mounted on one of said sash frame sections; at least a first movable fitting mounted on one of said window frame sections for cooperating with said fixed fitting; actuating means for said movable fitting, said acutating means comprising a flexible metal band extending about substantially the entire periphery of said window frame; tensioning means for said actuating means band, said tensioning means engaging the opposite ends of said band; lever means for imparting motion to said actuating means band; and rotatable tongue means operated by said lever means and engaging said tensioning means for causing longitudinal movement thereof. 